Question 1

When should I plant watermelon in ZIP 90012?

Accepted Answer

In ZIP 90012, the main watermelon target is around Feb 3, based on the representative Los Angeles frost station and USDA zone 10b.

Question 2

When should I start watermelon seeds indoors in 90012?

Accepted Answer

Start watermelon seeds indoors in ZIP 90012 around Dec 30, about 21 days before the Jan 20 last-frost estimate.

Question 3

When is the last frost in Los Angeles?

Accepted Answer

Los Angeles (ZIP 90012) has an average last spring frost around Jan 20, based on the representative Los Angeles frost station.

Question 4

When is the first frost in Los Angeles?

Accepted Answer

Los Angeles (ZIP 90012) has an average first fall frost around Dec 15, leaving about 329 frost-free days.

Question 5

Is this a guaranteed planting date?

Accepted Answer

No. GrowZone uses frost-date estimates, hardiness zones, and crop timing rules for planning. Local microclimates and current weather can shift the right date.

Step	Date	How to use it
Start Indoors	December 30, 2025	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	February 3, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	February 3, 2026	Sow seed outside when the crop and soil can handle the window.

Start watermelon seeds indoors around Dec 30

Watermelon dates for Los Angeles, CA